Влияние арктического ледяного покрова на внутригодовые колебания содержания CO2 в атмосфере Северного полушария

Голубев, В.Н.; Гребенников, П.Б.; Ржаницын, Г.А.; Сократов, С.А.; Фролов, Д.М.; Шишков, А.В.

Авторы: Голубев В.Н., Гребенников П.Б., Ржаницын Г.А., Сократов С.А., Фролов Д.М., Шишков А.В.
Журнал: Материалы гляциологических исследований
Номер: 101
Год издания: 2006
Первая страница: 49
Последняя страница: 54
Аннотация: Сезонный арктический ледяной покров рассматривается как мембрана, препятствующая газообмену атмосферы и океана. http://elibrary.ru/item.asp?id=17864975 The CO2 balance between the Earth surface geospheres is mainly regulated by the atmosphereocean gas exchange. The latter reaches dynamical equilibrium under certain relationships between the gas' partial pressure and the water temperature/salinity. The sea ice extent in Arctic seas annually varies from 11-13 millions km2 in March to 4-7 millions km2 in September. Since the sea ice is practically impermeable for the atmospheric gases, the variability of the sea ice extent unavoidably affects the gas balance. These effects are not yet fully accounted for in analysis and modeling of polar meteorology and global climate. High correlation between the seasonal variability of the atmospheric CO2 content and the sea ice extent is observed. The CO2 content decrease in the atmosphere and its increase in the sea water takes place during the period of the ice sea melt up to the minimal sea ice extent (MaySeptember). The increase of the CO2 content in the atmosphere of the Northern Hemisphere corresponds to the period of maximal development of the sea ice cover (April–October). The moments of change in the tendencies are strongly related to the nearsurface monthlymean air temperatures reaching the temperature of water freeze (ice melt). The amplitudes of the cycles increase with latitude: From 0-5 ppm at 10°S to 20 ppm at 60-80°N. The Arctic Seas dissolve at least 2,9 GtC in Spring–Summer seasons. This corresponds to additional flux at the interface and indicates formation of CO2 deficit in sea waters during winter seasons. Due to the sea icerelated seasonal cycles, the green gases effect is enhanced by additional 8 ppm of CO2 in the Northern Hemisphere, which is 2% more in compari son to Summer seasons respectively. The zone to the North from 60°N, where the amplitude of the seasonal change of the CO2 content in the atmosphere reaches 20 ppm, the green gases effect in Winter seasons becomes 6% higher than in Summers, and partly compensates the heat losses related to seasonal cycle of incoming Solar radiation, increase of the mean surface albedo and decrease in the atmospheric content of the water vapor.
Добавил в систему: Сократов Сергей Альфредович

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Влияние арктического ледяного покрова на внутригодовые колебания содержания CO2 в атмосфере Северного полушариястатья

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